SuperchargedSS

iTrader: (24)

I installed the PLX gauge a lil bit ago. When I start the truck and give it a little throttle, the gauge is reading 18-21. that is obviously wayyyy off! I'm not sure if I got it installed wrong or what the deal is? I have the vac line going from the small barb on the back of the blower manifold directly to the PLX module. When I remove the vac line from the module, i can feel it flowing air out so its definetly getting some sort of reading.

Also, the LEDs that scroll around the gauge (green, yellow, red) aren't lighting up, so I don't know if that matters or what? They light up in a scrolling pattern when I start the truck, but I think that's just a normal sequence.

Just want to make sure I didn't screw something up or miss something that was blatantly obvious.

Anyone with know-how on these specific gauges, please chime in!

Thanks in advance!

Derek @ EDO

iTrader: (73)

Robbie, is this the only module your running on the truck?
Do you have a PLX wideband setup?

SuperchargedSS

iTrader: (24)

yep, got a PLX wideband too, works perfect.

I should add that I do not have them daisy-chained, they are setup as stand alone.

Derek @ EDO

iTrader: (73)

I would make sure the module has a good power supply and ground. And make sure the gauge is connected to the TX slot on the module.

You may have to install the hose elsewhere as well.
I know some of the older trucks tap into the hose running to the FPR, im not sure whats the best place to tap in for your 06.
I would PM BlownChevy and ask him.

SuperchargedSS

iTrader: (24)

the +/- is good, made sure of that. I am leading to believe its where the vac line is hooked in to. I don't have any taps handy otherwise I'd explore some other options. Grrrrr!!!

SuperchargedSS

iTrader: (24)

anyone else?

therock

iTrader: (2)

Heh! You are seeing vacuum when you start up. This is indicated by no LED display.
LED displayed indicated pressure, no LED you have vacuum.

Read page 3 here.

Heh! I don't know who writes PLX technical documents but its the most scattered, covered and smothered stuff I have ever seen. Good thing for them its a good product.

BlownChevy

iTrader: (20)

Where do you have the boost/vac line plugged in? If it is plugged into the J-tube that will read vac only, you need to plug it into the 1/8 nipple on the back of the manifold UNDER the J-Tube.

SuperchargedSS

iTrader: (24)

I had thought about that and I guess I should go take it down the street and hammer the gas to see a reading. Thank you for the input!

On the manifold itself, not the Jtube. Just below the Jtube, near the MAP sensor (I believe?). There is a 1/8" NPT threaded piece coming up and then a small barb right next to it. I was told either one would be sufficient to get the boost psi out of, so I capped the NPT and hooked up the vac line on the barb. It's pretty tight fit, I can yank on it and it doesn't give, so it feels as though its sealed pretty well?

thunder550

iTrader: (70)

18-21 hg-in vacuum is normal, sounds like it's working correctly to me. What do you see when you're in boost?